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 Post subject: DSLR limited shutter?
PostPosted: Wed Sep 22, 2010 1:31 am 
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Joined: Tue Jul 27, 2010 8:57 am
Posts: 1551
Location: Winterpeg, Manisnowba, Canada
Alright, so I've been doing some reading, and I've read that DSLR cameras have a maximum shutter of 30 seconds, even in bulb mode! It's some safety feature of the camera, which astrophotographers must dread. The only way to get past this is plugging the camera into a computer and controlling it from the PC. Is this true? I hope not, because my laptop has a TERRIBLE battery life! :)

Thanks!

-Evan

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-Evan

Gear: 7 Nikon Nikkor AI-S and AF-S lenses, SB-700 flash, Nikon D7000, Nikon FM, variety of accessories

"There are no rules for good photographs, there are only good photographs."
- Ansel Adams


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 Post subject:
PostPosted: Wed Sep 22, 2010 3:48 am 
Not that I'm aware of. My D700 will open the shutter for as long as I keep it open, as would my D90, D300 and D70 before that. Where did you read this?


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 Post subject:
PostPosted: Wed Sep 22, 2010 5:35 am 
My Canon 500D will stay open as long as you want on bulb.. Well, until the battery goes flat.


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 Post subject:
PostPosted: Wed Sep 22, 2010 7:19 am 
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Joined: Mon Aug 17, 2009 9:46 pm
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Location: Norway
Same goes for my 50D, and the 450D before it. What you've read can't be true, at least not for all cameras

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 Post subject:
PostPosted: Wed Sep 22, 2010 12:11 pm 
Just to add-
My Olympus E510 has a max. timed-shutter of 60 sec., plus the "bulb" mode. My Sony H5 (not actually a DSLR), on the other hand, has a max. of 30 sec., and I'm unsure of bulb.
Using a remote (wired or IR) makes things a -lot- easier, especially for bulb.

Floyd.


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 Post subject:
PostPosted: Wed Sep 22, 2010 9:28 pm 
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Location: Winterpeg, Manisnowba, Canada
I forget where I read it, but it may have been about the D7000, which is a new camera.

Good to know that this isn't true on the other cams!

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-Evan

Gear: 7 Nikon Nikkor AI-S and AF-S lenses, SB-700 flash, Nikon D7000, Nikon FM, variety of accessories

"There are no rules for good photographs, there are only good photographs."
- Ansel Adams


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 Post subject:
PostPosted: Wed Sep 22, 2010 9:55 pm 
EvanK wrote:
I forget where I read it, but it may have been about the D7000, which is a new camera.

Good to know that this isn't true on the other cams!


No, the D7000 certainly won't have a 30 second limit. I can almost guarantee that. You'll have been reading the article incorrectly.


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 Post subject:
PostPosted: Sat Sep 25, 2010 9:38 am 
So the reason for that is simple: the sensor gets heated as it is exposed to light, the more it heats itself, the more noise you get, so eventually after a one minute exposure, even i very low light, the image can be unbareably noisy. Also, as we know, the overheating of electronics is not anything welcome.

This is why full frame sensors suffer less from noise, as the neighbouring pixels are more apart, they influence one another to a lesser extent. Result - less noise at greater ISO. It works the other way round too, the small compact lenses are very dense with pixels, so they suffer from noise much more.

So if you're after really long exposures, you have to go for the film. Here's a video, explaining everything:

http://www.youtube.com/watch?v=hpa15Jy5JZI

By the way, the tutorials they give are great not only for Nikon, they're good for understanding photography in general.


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 Post subject:
PostPosted: Sat Sep 25, 2010 10:15 am 
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Joined: Mon Jan 18, 2010 3:52 pm
Posts: 2175
Location: The Netherlands
For astrophotography it's possible to make shots of 20min each. But the noise is awful, and you have to take many shots, including Dark Frames.

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Panasonic DMC-FZ18, Panasonic DMC-FZ28, Canon G5, Canon 350D, Canon 50D + BG-E2N
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Canon 18-55 II plus lots of Minolta MD/M42 lenses and bodies


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